OPTICAL READING METHOD AND OPTICAL READING SYSTEM

摘要

An optical reading method which suppresses variations in the reading quality of a low-reflection optical recording medium. The optical reading method is to read information from an optical recording medium by irradiating the medium with read laser light having a wavelength lambda of 400 to 410 nm. In this method, an information recording layer of the optical recording medium is irradiated with the read laser light with an average read power Pra in excess of 1.2 mW if the information recording layer has a reflectance of 4% or less.